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Laser & Optoelectronics Progress, Volume. 62, Issue 16, 1612005(2025)

Power Line Extraction Algorithm Based on Improved-Canny and Sag Measurement Application

Xingzhi Ren, Yu Fang*, Diqing Fan, Hao Yang, Minghong Wang, and Qiangbao Ouyang
Author Affiliations
  • School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (19)
    Equations (13)
    References (18)
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    Paper Information
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    Figures & Tables(19)
    Sag measurement model

    Fig. 1. Sag measurement model

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    Sag measurement device

    Fig. 2. Sag measurement device

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    Power line image acquisition scenario

    Fig. 3. Power line image acquisition scenario

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    Partial acquired power line images

    Fig. 4. Partial acquired power line images

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    Flowchart of power line extraction algorithm

    Fig. 5. Flowchart of power line extraction algorithm

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    Flowchart of image preprocessing

    Fig. 6. Flowchart of image preprocessing

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    Power line edge detection

    Fig. 7. Power line edge detection

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    Principle diagram of HT

    Fig. 8. Principle diagram of HT

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    Power line extraction

    Fig. 9. Power line extraction

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    Edge detection results of different algorithms. (a) Single conductor; (b) bundled conductors; (c) bundled conductors with spacer bars against a blue sky background; (d) bundled conductors with spacer bars against a cloud background

    Fig. 10. Edge detection results of different algorithms. (a) Single conductor; (b) bundled conductors; (c) bundled conductors with spacer bars against a blue sky background; (d) bundled conductors with spacer bars against a cloud background

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    Power line extraction results. (a) Single conductor; (b) bundled conductors; (c) bundled conductors with spacer bars against a blue sky background; (d) bundled conductors with spacer bars against a cloud background

    Fig. 11. Power line extraction results. (a) Single conductor; (b) bundled conductors; (c) bundled conductors with spacer bars against a blue sky background; (d) bundled conductors with spacer bars against a cloud background

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    Field experiment power line images. (a) Single conductor; (b) bundled conductors

    Fig. 12. Field experiment power line images. (a) Single conductor; (b) bundled conductors

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    Automatic process for sag measurement

    Fig. 13. Automatic process for sag measurement

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    Comparison of error rates for sag

    Fig. 14. Comparison of error rates for sag

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    • Table 1. PSNR values ​​of different algorithms

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      Table 1. PSNR values ​​of different algorithms

      ImageCannySobelPrewittImproved-Canny
      Fig. 10（a）5.025.574.995.91
      Fig. 10（b）3.844.273.774.34
      Fig. 10（c）6.346.876.246.97
      Fig. 10（d）5.195.685.125.82

    • Table 2. Total number of edge points extracted by different algorithms

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      Table 2. Total number of edge points extracted by different algorithms

      ImageCannySobelPrewittImproved-Canny
      Fig. 10（a）13290172017271883
      Fig. 10（b）6279589459005967
      Fig. 10（c）10545505550815313
      Fig. 10（d）10570538554125750

    • Table 3. Edge image statistics of different algorithms

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      Table 3. Edge image statistics of different algorithms

      ImageC/AC/B
      CannySobelPrewittImproved-CannyCannySobelPrewittImproved-Canny
      Fig. 10（a）0.0290.0430.0490.0020.1890.2030.2260.018
      Fig. 10（b）0.0110.0200.0240.0030.0910.1270.1510.024
      Fig. 10（c）0.0340.0090.0130.0030.1770.0290.0400.023
      Fig. 10（d）0.0250.0050.0090.0030.1710.0250.0480.028

    • Table 4. Power line extraction accuracies

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      Table 4. Power line extraction accuracies

      Image typeImage quantityCorrect quantityAccuracy /%
      Single conductor25123995.219
      Bundled conductors20819995.673
      Total45943895.425

    • Table 5. Comparison of data collected using different methods

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      Table 5. Comparison of data collected using different methods

      TestMeasuring time /minSag /mError rate of sag /%
      ManualAutomaticManualAutomaticManualAutomatic
      Average26.36116.02015.9315.712.121.46
      125.71616.51716.3315.954.682.24
      226.07316.33315.8415.801.541.28
      326.15415.66715.7215.830.771.47
      425.43516.01715.8815.431.791.09
      527.43615.90015.7115.330.711.73
      626.45816.06715.8415.701.540.64
      727.62317.83316.0415.882.821.79
      825.92615.53716.1415.823.461.41
      926.06514.96315.7915.911.221.99
      1026.72115.36216.0215.452.690.96
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    Xingzhi Ren, Yu Fang, Diqing Fan, Hao Yang, Minghong Wang, Qiangbao Ouyang. Power Line Extraction Algorithm Based on Improved-Canny and Sag Measurement Application[J]. Laser & Optoelectronics Progress, 2025, 62(16): 1612005

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    Paper Information

    Category: Instrumentation, Measurement and Metrology

    Received: Jan. 23, 2025

    Accepted: Mar. 28, 2025

    Published Online: Jul. 24, 2025

    The Author Email: Yu Fang (fangyu_hit@126.com)

    DOI:10.3788/LOP250574

    CSTR:32186.14.LOP250574

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology